Bowlby highlights the importance of positive attachment experiences and maintaining a monotropic bond in the first five years, which has useful practical applications.
Practicalapplications for parents and caregiver providers is useful in supporting children who have been in institutional care.
Some countries like Sweden offer 480 days parental leave, clearly highlighting its commitment to support children’s early attachment experiences.
As Bowlby was asking the adolescent participants to recall separations that they had experienced years earlier, their responses would have been subject to inaccuracies/ distortions.
Bowlby designed and conducted the self-reports himself and as a result, his presence and interpretation might have influenced the outcome of the research.
Bowlby's research was conducted by himself which makes it more subjective.
Bowlby found a relationship between early separation and delinquency/ affectionless psychopathy but we cannot definitively conclude that the separation was the cause.
Bowlby's research is correlational suggesting problems with cause and effect.
Bowlby's supporting research relied on retrospective data which could be unreliable.
Rutter (1981) offers an alternative negative experience called privation (never having formed an attachment bond).
Bowlby's research focused on the mother as the primary caregiver which may not be the case in all circumstances.
Bowlby's ideas were from the 1940s and 50s where gender roles were different, suggesting they may lack temporal validity.
Bowlby suggested maternal deprivation caused irreversible negative effects but other research contradicts this.
Koluchova (1976) reported the case of the Czech twins who suffered abuse until the age of 7 but were able to reform secure attachments after adoption.
Lewis (1954) found no association between early separation and later psychopathy.
Gao et al (2010) supports Bowlby by showing poorquality maternal care was associated with high rates of psychopathy in adults.